in the silicon errata of this device, the eeprom is mentioned nowhere.

tino

************************************************************************
******************************


>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>On Behalf Of Michael Rigby-Jones
>Sent: Friday, June 24, 2005 2:06 PM
>To: Microcontroller discussion list - Public.
>Subject: RE: [PIC]: eeprom loses data on high ambient temerature
>
>
>
>
>>-----Original Message-----
>>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu]
>>Sent: 24 June 2005 06:59
>>To: Microcontroller discussion list - Public.
>>Subject: [PIC]: eeprom loses data on high ambient temerature
>>
>>
>>i have a pic based device in my car (16f872) which is always on.
>>
>>this device has it's configuration stored in the internal
>>eeprom of the pic.
>>
>>when it's cold out there, everything works fine, but as soon
>>as it gets really hot in summer, the eeprom loses some bytes 
>>of it's configuration (usually addresses 0 and 1). the code, 
>>running, never writes to any address of the eeprom. only a 
>>read access then and now.
>>
>>has anyone seen this before?
>
>Yes, I had a nightmare with a whole batch of 18F devices that 
>would read 0x00 from any location above a certain temperature. 
> Correct operation was restored at lower temperatures unless a 
>write was attempted at the higher temperature where the EEPROM 
>would be corrupted.
>
>Check the erratas for the part.
>
>Regards
>
>Mike
>
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